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Updated: Jul 13, 2026
Mouse Models Of Helicobacter Infection And Gastric Pathologies
Published on: October 18, 2018
Animal models of stomach carcinogenesis
Tetsuya Tsukamoto1, Tsutomu Mizoshita, Masae Tatematsu
1Division of Oncological Pathology, Aichi Cancer Center Research Institute, Nagoya, Japan. ttsukamt@aichi-cc.jp
Abstract:
Although incidences of stomach cancer have decreased over the past several decades, the disease remains an important public health problem. To identify pathological and molecular biochemical mechanisms, various experimental animal models have been established in rats and mice with chemical carcinogens including N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and N-methyl-N-nitrosourea (MNU). Helicobacter pylori(H. pylori) is one of the most important factors for human stomach disorders, including neoplasia, and the H. pylori-infected and carcinogen-treated Mongolian gerbil (MG) has proven very useful for analyses of underlying processes. The findings with this model support the hypothesis that intestinal metaplasia is important not as a precancerous lesion but rather as a paracancerous condition and that intestinalization of stomach cancer progresses with chronic inflammation. Furthermore, dose-dependent enhancing effects of salt on stomach carcinogenesis could be demonstrated in MGs treated with MNU and H. pylori modifying surface mucous gel layer. H. pylori itself only causes chronic inflammation and acts as a promoter of stomach carcinogenesis in experimental models. Based on the precise pathological diagnosis of stomach lesions such as noncancerous heterotopic proliferative glands (HPG) and adenocarcinomas, a basis for understanding mechanisms of carcinogenesis has been established on which chemoprevention can be modeled.
Insights
This study reveals that Helicobacter pylori acts as a promoter in stomach cancer development, not a cause. Salt intake also enhances stomach carcinogenesis in animal models, offering insights for prevention strategies.
Area of Science:
- Gastroenterology
- Oncology
- Pathology
Background:
- Stomach cancer remains a significant public health concern despite declining incidence.
- Experimental animal models using chemical carcinogens (MNNG, MNU) and Helicobacter pylori (H. pylori) have been developed to study disease mechanisms.
- The Mongolian gerbil (MG) model infected with H. pylori and treated with carcinogens is valuable for analyzing stomach neoplasia.
Purpose of the Study:
- To investigate the pathological and molecular mechanisms of stomach cancer.
- To evaluate the role of H. pylori and salt in stomach carcinogenesis.
- To understand the significance of intestinal metaplasia and chronic inflammation in cancer progression.
Main Methods:
- Utilized experimental animal models, including Mongolian gerbils, treated with chemical carcinogens (MNU) and infected with H. pylori.
- Conducted precise pathological diagnosis of stomach lesions, including heterotopic proliferative glands (HPG) and adenocarcinomas.
- Assessed the dose-dependent effects of salt on stomach carcinogenesis.
Main Results:
- Findings support intestinal metaplasia as a paracancerous condition, not precancerous, with cancer progression linked to chronic inflammation.
- Demonstrated dose-dependent enhancement of stomach carcinogenesis by salt in MNU and H. pylori-treated MGs.
- Confirmed H. pylori acts as a promoter, not a direct cause, of stomach carcinogenesis in experimental models.
Conclusions:
- Established a basis for understanding stomach carcinogenesis mechanisms, including the roles of chronic inflammation and salt.
- The H. pylori-infected and carcinogen-treated MG model is effective for studying stomach cancer.
- These findings provide a foundation for developing chemoprevention strategies against stomach cancer.
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